Sir David Attenborough is calling on the public to help reverse butterfly declines by taking part in the world’s largest butterfly survey. The Big Butterfly Count encourages people to spot and record 18 species of common butterflies and two day-flying moths during three weeks of high summer.

There are two easy ways to take part in the Big Butterfly Count:

Visit the Big Butterfly Count website to download and print an ID chart. Take it out with you to make a record of the butterflies you spot then simply log back on and tell us what you've seen.

If you have a smartphone then the free Big Butterfly Count app will help you identify different species and allow you to record them there and then, saving paper as well as butterflies.

Don't forget to join in with the Count on Twitter using #ButterflyCount